"""Flask 实例接入 trade policy（三所 app.py 共用）。"""
from __future__ import annotations

from typing import Callable, Tuple

from lib.trade.trade_policy_lib import (
    TradePolicy,
    assert_direction_allowed,
    assert_symbol_allowed,
    assert_trade_policy_open,
    trade_policy_to_dict,
)


def trade_policy_template_context(policy: TradePolicy) -> dict:
    return trade_policy_to_dict(policy)


def default_symbol_for_policy(policy: TradePolicy, raw_default: str) -> str:
    d = (raw_default or "BTC/USDT").strip() or "BTC/USDT"
    if policy.symbol_restrict_enabled and policy.symbol_whitelist:
        from lib.trade.trade_policy_lib import symbol_base_coin

        base = symbol_base_coin(d)
        if base not in policy.symbol_whitelist:
            return f"{policy.symbol_whitelist[0]}/USDT"
    return d


def check_symbol_policy(
    policy: TradePolicy,
    symbol: str,
    normalize_symbol_fn: Callable[[str], str],
) -> Tuple[bool, str]:
    return assert_symbol_allowed(
        policy, symbol, normalize_symbol_fn=normalize_symbol_fn
    )


def check_direction_policy(policy: TradePolicy, direction: str) -> Tuple[bool, str]:
    return assert_direction_allowed(policy, direction)


def check_open_policy(
    policy: TradePolicy,
    symbol: str,
    direction: str,
    normalize_symbol_fn: Callable[[str], str],
) -> Tuple[bool, str]:
    return assert_trade_policy_open(
        policy, symbol, direction, normalize_symbol_fn=normalize_symbol_fn
    )